The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_input.h

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    1 /*-
    2  * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  *
   25  * $FreeBSD: releng/8.0/sys/net80211/ieee80211_input.h 195757 2009-07-18 20:19:53Z sam $
   26  */
   27 #ifndef _NET80211_IEEE80211_INPUT_H_
   28 #define _NET80211_IEEE80211_INPUT_H_
   29 
   30 /* Verify the existence and length of __elem or get out. */
   31 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen, _action) do {        \
   32         if ((__elem) == NULL) {                                         \
   33                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,            \
   34                     wh, NULL, "%s", "no " #__elem );                    \
   35                 vap->iv_stats.is_rx_elem_missing++;                     \
   36                 _action;                                                \
   37         } else if ((__elem)[1] > (__maxlen)) {                          \
   38                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,            \
   39                     wh, NULL, "bad " #__elem " len %d", (__elem)[1]);   \
   40                 vap->iv_stats.is_rx_elem_toobig++;                      \
   41                 _action;                                                \
   42         }                                                               \
   43 } while (0)
   44 
   45 #define IEEE80211_VERIFY_LENGTH(_len, _minlen, _action) do {            \
   46         if ((_len) < (_minlen)) {                                       \
   47                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,            \
   48                     wh, NULL, "ie too short, got %d, expected %d",      \
   49                     (_len), (_minlen));                                 \
   50                 vap->iv_stats.is_rx_elem_toosmall++;                    \
   51                 _action;                                                \
   52         }                                                               \
   53 } while (0)
   54 
   55 #ifdef IEEE80211_DEBUG
   56 void    ieee80211_ssid_mismatch(struct ieee80211vap *, const char *tag,
   57         uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid);
   58 
   59 #define IEEE80211_VERIFY_SSID(_ni, _ssid, _action) do {                 \
   60         if ((_ssid)[1] != 0 &&                                          \
   61             ((_ssid)[1] != (_ni)->ni_esslen ||                          \
   62             memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) {   \
   63                 if (ieee80211_msg_input(vap))                           \
   64                         ieee80211_ssid_mismatch(vap,                    \
   65                             ieee80211_mgt_subtype_name[subtype >>       \
   66                                 IEEE80211_FC0_SUBTYPE_SHIFT],           \
   67                                 wh->i_addr2, _ssid);                    \
   68                 vap->iv_stats.is_rx_ssidmismatch++;                     \
   69                 _action;                                                \
   70         }                                                               \
   71 } while (0)
   72 #else /* !IEEE80211_DEBUG */
   73 #define IEEE80211_VERIFY_SSID(_ni, _ssid, _action) do {                 \
   74         if ((_ssid)[1] != 0 &&                                          \
   75             ((_ssid)[1] != (_ni)->ni_esslen ||                          \
   76             memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) {   \
   77                 vap->iv_stats.is_rx_ssidmismatch++;                     \
   78                 _action;                                                \
   79         }                                                               \
   80 } while (0)
   81 #endif /* !IEEE80211_DEBUG */
   82 
   83 /* unalligned little endian access */     
   84 #define LE_READ_2(p)                                    \
   85         ((uint16_t)                                     \
   86          ((((const uint8_t *)(p))[0]      ) |           \
   87           (((const uint8_t *)(p))[1] <<  8)))
   88 #define LE_READ_4(p)                                    \
   89         ((uint32_t)                                     \
   90          ((((const uint8_t *)(p))[0]      ) |           \
   91           (((const uint8_t *)(p))[1] <<  8) |           \
   92           (((const uint8_t *)(p))[2] << 16) |           \
   93           (((const uint8_t *)(p))[3] << 24)))
   94 
   95 static __inline int
   96 iswpaoui(const uint8_t *frm)
   97 {
   98         return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
   99 }
  100 
  101 static __inline int
  102 iswmeoui(const uint8_t *frm)
  103 {
  104         return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
  105 }
  106 
  107 static __inline int
  108 iswmeparam(const uint8_t *frm)
  109 {
  110         return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
  111                 frm[6] == WME_PARAM_OUI_SUBTYPE;
  112 }
  113 
  114 static __inline int
  115 iswmeinfo(const uint8_t *frm)
  116 {
  117         return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
  118                 frm[6] == WME_INFO_OUI_SUBTYPE;
  119 }
  120 
  121 static __inline int
  122 isatherosoui(const uint8_t *frm)
  123 {
  124         return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
  125 }
  126 
  127 static __inline int
  128 istdmaoui(const uint8_t *frm)
  129 {
  130         return frm[1] > 3 && LE_READ_4(frm+2) == ((TDMA_OUI_TYPE<<24)|TDMA_OUI);
  131 }
  132 
  133 static __inline int
  134 ishtcapoui(const uint8_t *frm)
  135 {
  136         return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI);
  137 }
  138 
  139 static __inline int
  140 ishtinfooui(const uint8_t *frm)
  141 {
  142         return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI);
  143 }
  144 
  145 void    ieee80211_deliver_data(struct ieee80211vap *,
  146                 struct ieee80211_node *, struct mbuf *);
  147 struct mbuf *ieee80211_defrag(struct ieee80211_node *,
  148                 struct mbuf *, int);
  149 struct mbuf *ieee80211_realign(struct ieee80211vap *, struct mbuf *, size_t);
  150 struct mbuf *ieee80211_decap(struct ieee80211vap *, struct mbuf *, int);
  151 struct mbuf *ieee80211_decap1(struct mbuf *, int *);
  152 int     ieee80211_setup_rates(struct ieee80211_node *ni,
  153                 const uint8_t *rates, const uint8_t *xrates, int flags);
  154 void ieee80211_send_error(struct ieee80211_node *,
  155                 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg);
  156 int     ieee80211_alloc_challenge(struct ieee80211_node *);
  157 int     ieee80211_parse_beacon(struct ieee80211_node *, struct mbuf *,
  158                 struct ieee80211_scanparams *);
  159 int     ieee80211_parse_action(struct ieee80211_node *, struct mbuf *);
  160 #endif /* _NET80211_IEEE80211_INPUT_H_ */

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